This is a cave near the Lightleaf Forest's lake. Many Fire-type Pokémon live here. The cave got its name from the orange color of the rocks, but the stones, despite the name, aren't actual Fire Stones. It is always hot here, even if the weather is freezing cold outside. The temperature is at its highest in summer, also making the Fire-types' power spike. It is at its lowest - only about 78 degrees Fahrenheit - in the winter, making it a popular spot for Trainers to enter in winter.
It also has a hot spring in the center, where Fire-types heal themselves when they're hurt.